<!DOCTYPE html>
<script>
    onload = function() {
        document.body.offsetTop; // trigger layout
        document.getElementById('elm').style.display = 'block';
    }
</script>
<p>Test changing the contents of a table cell, increasing column height</p>
<p>You should see the text "first column" once in the first column, and the text "second
    column" twice in the second column.</p>
<div style="-webkit-columns:2; -webkit-column-rule:1px solid; -webkit-column-gap:11px; width:511px; background:yellow;">
    <div style="display:table-row;">
        first column
        <div style="height:0.1em;"></div>
    </div>
    <div style="display:table-row;">
        second column
        <div id="elm" style="display:none;">second column</div>
    </div>
</div>